<!--父级页面:控制除登录页以外所有页面共有的头部与左侧菜单栏-->
<template>
  <!-- display: flex 实现弹性布局  -->
  <div style="display: flex">
    <!--      2.实现左侧折叠菜单栏 -->
    <div :style="{width: (isCollapse ? '64px' : '208px')}">
      <!--      左侧菜单栏
                :collapse-transition="false" 去掉折叠动画
                eg: min-height 100vh 与 height: 100vh 的不同 min-height: 100vh当翻页的时候不会动,但是那个一翻页会有有空白
      -->
      <el-menu
          background-color="#3c82f5"
          style="width: 100%;height: 100%;min-height: 100vh;"
          text-color="#fff"
          active-text-color="#f000"
          :collapse="isCollapse"
          :collapse-transition="false"
          unique-opened router
          @select="selectMenu"
      >
        <!--        左侧菜单栏的顶部条,注意:顶部条也要写在 el-menu中 -->
        <el-row style="padding-top: 10px">
          <el-col :span="2">
          </el-col>
          <el-col :span="7" style="padding-left: 7px">
            <el-avatar src="imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse?0:13">
            <router-link to="/"
                         style="color:#fff;
                         text-decoration: none;
                         position: relative;
                         top: 8px;
                         left: 2px;
                         font-weight: bold">
              智慧车辆
            </router-link>
          </el-col>
        </el-row>
        <!--        左侧菜单栏的导航项 -->
        <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size: 21px;">
              <User/>
            </el-icon>
            <span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size: 21px;">
              <Van/>
            </el-icon>
            <span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">基本信息</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size: 21px;">
              <Place/>
            </el-icon>
            <span>调度管理</span>
          </template>
          <!--          菜单下的子菜单 (菜单项)-->
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">调度审核</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size: 21px;">
              <Location/>
            </el-icon>
            <span>电子围栏</span>
          </template>
          <el-menu-item index="/user">围栏管理</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <!--          #title写的是菜单的标题 -->
          <template #title>
            <el-icon style="font-size: 21px;">
              <MessageBox/>
            </el-icon>
            <span>数据字典</span>
          </template>
          <el-menu-item index="/user">字典管理</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{width: (isCollapse ? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
      <!--        右侧:顶部菜单栏 -->
      <el-header style="background-color: #fff;padding-top: 22px;height: 10vh; ">
        <!--        折叠图标与退出登录-->
        <el-row :gutter="10">
          <el-col :span="18">
            <el-icon style="font-size: 20px;position: relative;top: 3px" @click="changeCollapsed">
              <Expand/>
            </el-icon>
          </el-col>
          <el-col :span="6" style="position:relative">
<!--         <template #dropdown> 封装下拉菜单    -->
            <el-dropdown trigger="click" style="position:absolute;right: 20px">
              <span style="font-size: 19px;font-weight: bold">
                {{ user.username }}
                <el-icon><arrow-down/></el-icon>
              </span>
              <template #dropdown>
                <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!--      右侧主体内容-->
        <el-breadcrumb separator="/" style="position: relative;top: 20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadCrumb">{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
      <el-main style="padding: 0;min-height: 90vh;overflow-y: auto">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import {ref} from "vue";
import router from "@/router";

const isCollapse = ref(false);

const changeCollapsed = () => {
  isCollapse.value = !isCollapse.value;
}
const user = ref(getUser());
if (user==null){
  router.push('/login');
}


// 退出登录功能
const logout = () => {
  if (confirm('确认要退出吗?')) {
    localStorage.removeItem('user');
    window.location.href = '/login';
    user.value = '';
  }

  //设置变量保存当前的面包屑导航的值，默认为用户列表界面
//||:如果localStorage.getItem('breadcrumb')的结果为null或undefined（即没有找到名为'breadcrumb'的项或其值为空）
//则逻辑OR运算符会执行右侧的操作，即返回'["用户管理", "用户列表"]'作为默认值。
const breadCrumb = ref(JSON.parse(localStorage.getItem('breadcrumb') || '["用户管理", "用户列表"]'));
//定义数组维护不同页面的面包屑值
  let map = {
    '/user':['用户管理','用户列表'],
    '/vehicle': ['车辆管理','基本信息'],
    '/application': ['调度管理','申请列表'],
    '/audit': ['调度管理','调度审核'],
    '/distribute':['调度管理','车辆分配'],
    '/geofence':['电子围栏','围栏管理'],
    '/dict':['数据字典','字典管理']
  }

  // 选择菜单的时候会触发
  const selectMenu = (index)=>{
    // 根据选择的菜单项设置面包屑的值
    breadCrumb.value=map[index];
    // 把面包屑得到值存储在LocalStorage中,防止刷新页面时数据丢失
    localStorage.setItem('breadcrumb',JSON.stringify(breadCrumb.value));
  }
}


</script>